mohammed morsi are sounding the call for nationwide protests again tomorrow against a constitution drafted by islamists. the opposition was bolstered after saturday's first round of voting on the document. only about a third of eligible voters turned out, as 57% approved the draft-- a much lower level of support than predicted. the second round of voting is saturday. those are some of the day's major stories. now, back to judy. >> woodruff: and we pick up now on some of the major questions being asked about guns, mental health and other issues in the aftermath of the shootings. we get four perspectives. dan gross is the president of the brady campaign to end gun violence. david kopel is an adjunct professor of constitutional law at the university of denver and the research director for the libertarian-leaning independence institute. katharine nordal is with the american psychological association. and dr. irwin redlener is a pediatrician at columbia university who works on public and family health issues. he's the president of the children's health fund. we thank you all for being with us.